Each episode is about an individual artist, except for the one that's about both Nas and Dave East. For more insight on how that came about, here's what director Sacha Jenkins (who's also the creative director of Mass Appeal and co-founder of Ego Trip) recently said to UPROXX:

I directed the Nas and Dave East episode because there’s already a film called Time Is Illmatic, about Nas’s life. It’s a great film, [but] we’ve been seeing Nas for twenty-five years, and I thought to myself, Well, what can I do that’s different? And then I thought about Dave East. Myself, Dave, and Nas are all pretty much from the same neighborhood. And so I believe that for people to see the rapport that Dave and Nas have, to see this mentor/mentee relationship, I thought was really powerful. But I also thought it’s going to bring in younger viewers who know Dave East and who are fans currently. And it’s going to bridge those young folks with their parents who like Nas.

[...] Me and Nas [went] to the same junior high, when the guidance counselors told us that all we could do is go to vocational school. So, Nas could have gone to vocational school and he could have fixed refrigerators and that would have been cool. But, we might not have had Nas. So hip-hop has changed his life and changed my life and changed the lives of so many people. Not only the people who make the music, but the people who hear the music have been changed and affected by it. So, it’s powerful.

You can read more of that interview here. Stream the soundtrack and watch the trailer for the Nas & Dave East episode and the T.I. episode below: